DIAMOND BAR >> A judge ruled Tuesday that there was enough evidence to try a San Dimas woman for the involuntary manslaughter of her 77-year-old mother-in-law whose dismembered body was found in the trunk of the SUV she was driving, authorities said.

The prosecution originally charged Un Young Lee, 43, with the murder of Young Ja Lee of Diamond Bar as well as arson of an inhabited structure.

After her Tuesday preliminary hearing at Pomona Superior Court, she was held to answer to the involuntary manslaughter and arson charges, according to Sarah Ardalani, spokeswoman for the District Attorney’s Office.

She said Lee returns to court April 13 for an arraignment.

The prosecution believes Young Ja Lee was killed sometime between March 23-25, 2015. On March 25, her home in the 1200 block of North Diamond Bar Boulevard was set on fire.

Un Young Lee told a detective she and her mother-in-law argued. There was a pushing match. Young Ja Lee allegedly hit her head when she fell, became unconscious and died.

Lee claimed she panicked and dismembered the body, according to Lt. Eddie Hernandez of the Sheriff’s Homicide Bureau.

A tip led police to Tustin on March 25, 2015 where Lee was found with the victim’s remains in plastic bags in the trunk.

Ruby Gonzales started working for the company in 1991. Since then she has written about cities, school districts, crimes, cold cases, courts, the San Gabriel River, local history, anime, insects, forensics and the early days of the Internet when people still referred to it as the "information superhighway." Her current beat includes breaking news, crimes and courts for the San Gabriel Valley Tribune, Pasadena Star News and Whittier Daily News. When not in crime reporter mode, she frequents the remaining bookstores in the San Gabriel Valley, haunts craft stores or gets dragged to eateries by a relative who is a foodie.